I use a unique hidden form variable to detect and prevent
duplicate submission of the same form, when the consequences warrant.
It works like this:
# Generate the form:
self.write('''
<form method="post" ...>
%s
...
</form>
''' % (self.postId(), ...))
# Before processing the POSTed form data:
if self.isReposted():
... duplicate submission: complain and do not process
And here's the code in SitePage to implement the above:
def postId(self):
""" Add a unique posting identifier to the form """
id = '%s%s' % (time.time(), random.random())
return '<input type=hidden name="__form_post_id" value="%s">' % id
def isReposted(self):
""" Return true if we've already processed this submission """
id = self.request().field('__form_post_id', '')
if not id: # odd...
return 0
sess = self.session()
did = sess.value('__forms_seen', {})
if id in did:
return 1
did[id] = 1
sess.setValue('__forms_seen', did)
return 0
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